Angle tuning-free THz collinear difference frequency radiation system based on cadmium telluride

Abstract

The invention discloses an angle tuning-free nanosecond laser collinear difference frequency THz radiation system based on cadmium telluride crystals. The system can achieve THz light radiation without angle tuning by particularly using the principle of nonlinear optical collinear difference frequency and quasi-phase matching technology, and the wavelength tuning range of the system is 0.80THz to 2.74THz. The system not only has the characteristics of high power, quasi-continuity, narrow line width, room temperature operation and so on, but also has the advantages of convenient wavelength tuning by only tuning the output wavelength of a tunable laser, high easiness in adding an external infrared resonant cavity, compact structure, easy construction, high system stability, high convenience for actual large-scale application and so on in comparison with a radiation system using birefringent crystals as THz crystals and a parametric oscillation source based on lithium niobate crystals.

Description

technical field [0001] The invention relates to the field of terahertz radiation measurement, in particular to a terahertz wave collinear difference frequency radiation system without angle tuning. Background technique [0002] Terahertz waves (0.1-10THz), whose electromagnetic spectrum is between microwave and infrared, have a series of unique properties. Acoustic phonons and optical phonons in solids, defect states and impurity state energy levels in semiconductors, and subband transition energies in superlattice semiconductors are all concentrated in this wavelength range. Known as one of the top ten science and technology changes in the 21st century, terahertz science and technology have or will provide communication, radar, electronic countermeasures, electromagnetic weapons, astronomy, medical imaging, non-destructive testing, security inspection, military anti-terrorism, biochemical , materials science and other fields have brought a wide range of applications and fa...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the disadvantages of the current nanosecond laser difference frequency terahertz radiation system, such as poor system stability, high operational difficulty, and unfavorable practical large-scale application, the present invention proposes the use of nonlinear optical collinear difference frequency principle and quasi-phase matching technology, in An angle-free tunable terahertz optical radiation system is implemented in cadmium telluride crystals. This system not only meets the characteristics of radiating high-power quasi-continuous near-monochromatic broadband terahertz light waves, but also satisfies the convenience of terahertz light wavelength tuning. The system High stability, convenient for large-scale application and other outstanding advantages

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